Maps of the magnetic anomaly field at Earth's surface from scalar satellite data

1996 ◽  
Vol 23 (1) ◽  
pp. 41-44 ◽  
Author(s):  
R. A. Langel ◽  
K. A. Whaler
Keyword(s):  
Magnetic Anomaly ◽  
Satellite Data ◽  
Anomaly Field

A Calculation Method of Magnetic Anomaly Field Distribution of Ellipsoid with Arbitrary Posture

2021 ◽  
Author(s):  
Song-tong Han ◽  
Bo Zhang ◽  
Xiao-li Rong ◽  
Lei-xiang Bian ◽  
Guo-kai Zhang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Finite Element ◽  
Magnetic Anomaly ◽  
Field Distribution ◽  
Calculation Method ◽  
Gravity Potential ◽  
Anomaly Field ◽  
Finite Element Software ◽  
Wide Range ◽  
Distribution Equation

The ellipsoidal magnetization model has a wide range of application scenarios. For example, in aviation magnetic field prospecting, mineral prospecting, seabed prospecting, and UXO (unexploded ordnance) detection. However, because the existing ellipsoid magnetization formula is relatively complicated, the detection model is usually replaced by a dipole. Such a model increases the error probability and poses a significant challenge for subsequent imaging and pattern recognition. Based on the distribution of ellipsoid gravity potential and magnetic potential, the magnetic anomaly field distribution equation generated by the ellipsoid is deduced by changing the aspect ratio, making the ellipsoid equivalent to a sphere. The result of formula derivation shows that the two magnetic anomaly fields are consistent. This paper uses COMSOL finite element software to model UXO, ellipsoids, and spheres and analyzes magnetic anomalies. The conclusion shows that the ellipsoid model can completely replace the UXO model when the error range of 1nT is satisfied. Finally, we established two sets of ellipsoids and calculated the magnetic anomalous field distributions on different planes using deduction formulas and finite element software. We compared the experimental results and found that the relative error of the two sets of data was within [Formula: see text]‰. Error analysis found that the error distribution is standardized and conforms to the normal distribution. The above mathematical analysis and finite element simulation prove that the calculation method is simple and reliable and provides a magnetic field distribution equation for subsequent UXO inversion.

scholarly journals A Spherical Cap Harmonic Model of the Satellite Magnetic Anomaly Field Over China and Adjacent Areas.

1992 ◽  
Vol 44 (3) ◽  
pp. 243-252 ◽  
Author(s):  
Zhen-chang AN ◽  
Shi-zhuang MA ◽  
Dong-hai TAN ◽  
D. R. BARRACLOUGH ◽  
D. J. KERRIDGE
Keyword(s):  
Magnetic Anomaly ◽  
Harmonic Model ◽  
Spherical Cap ◽  
Anomaly Field ◽  
Spherical Cap Harmonic Model

Analysis of the magnetic anomaly field of the volcanic district of the Bay of Naples, Italy

2003 ◽  
Vol 24 (3-4) ◽  
pp. 207-221 ◽  
Author(s):  
M. Secomandi ◽  
V. Paoletti ◽  
G. Aiello ◽  
M. Fedi ◽  
E. Marsella ◽  
...  
Keyword(s):  
Magnetic Anomaly ◽  
Anomaly Field

scholarly journals Magnetic Anomaly Fields Determined from Gradient Measurements at Stratospheric Altitudes and from Magsat Satellite Data.

1997 ◽  
Vol 49 (5) ◽  
pp. 689-699
Author(s):  
Yu. P. Tsvetkov ◽  
N. M. Rotanova ◽  
V. N. Oraevsky ◽  
S. D. Odintsov
Keyword(s):  
Magnetic Anomaly ◽  
Satellite Data ◽  
Gradient Measurements
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